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dwc3: gadget: Implement the suspend entry event handler

Message ID cf36e3326e40030d96190bcd2cac200e8fb7ff4e.1463388153.git.baolin.wang@linaro.org
State Accepted
Commit 72704f876f50b00f08d41d4b13d5a5d11262254f
Headers show

Commit Message

(Exiting) Baolin Wang May 16, 2016, 8:43 a.m. UTC 
It had changed to be suspend event for BIT6 in DEVT register from
version 2.30a and above. Thus this patch introduces one suspend
event handler to handle the suspend event.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

---
 drivers/usb/dwc3/gadget.c |   26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

-- 
1.7.9.5
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Patch

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 8e4a1b1..9b14ecc 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2595,6 +2595,17 @@  static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
 	dwc->link_state = next;
 }
 
+static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
+					  unsigned int evtinfo)
+{
+	enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
+
+	if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
+		dwc3_suspend_gadget(dwc);
+
+	dwc->link_state = next;
+}
+
 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
 		unsigned int evtinfo)
 {
@@ -2646,7 +2657,20 @@  static void dwc3_gadget_interrupt(struct dwc3 *dwc,
 		dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
 		break;
 	case DWC3_DEVICE_EVENT_EOPF:
-		dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame");
+		/* It changed to be suspend event for version 2.30a and above */
+		if (dwc->revision < DWC3_REVISION_230A) {
+			dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame");
+		} else {
+			dwc3_trace(trace_dwc3_gadget, "U3/L1-L2 Suspend Event");
+
+			/*
+			 * Ignore suspend event until the gadget enters into
+			 * USB_STATE_CONFIGURED state.
+			 */
+			if (dwc->gadget.state >= USB_STATE_CONFIGURED)
+				dwc3_gadget_suspend_interrupt(dwc,
+						event->event_info);
+		}
 		break;
 	case DWC3_DEVICE_EVENT_SOF:
 		dwc3_trace(trace_dwc3_gadget, "Start of Periodic Frame");